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Statistics - Finding a Z-Score

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I am working through an online problem (UoP ALEKS training) regarding Normal Distribution. I understand how the system works the problem up until the end. It says:

Using the calculator, we have:

P(X<0)=P(Z<-1.0833)

They obtain a value of 0.1393

I have put in the value of -1.0833 for the z value, but it says that is undefined. Am I missing a step that I should know and they just aren't spelling it out for me?

Thank you very much.

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